Notes are the written pitch.
Frequencies are the sounding frequency, for Bb saxophone.
Unless otherwise stated, the impedance spectrum is for a Bb saxophone.

Impedance spectrum of a Bb soprano
saxophone measured using fingering for C6.

This is the eleventh note in the second register, meaning it plays on the second impedance peak . It differs from C5 (the corresponding note in the first register) in that it uses a register hole. This causes a leak in the bore that weakens the first impedance peak, but has little affect on higher peaks – see register hole for an explanation, and compare with C5, whose impedance spectrum is almost identical except for the first peak. Note that, even with the weaking effect of the register key, the first peak is higher than the second. Both peaks will play, using different embouchures. Above about 1 kHz, the third peak is hugely weakened and the rest of the curve is irregular: see the discussion in cut-off frequency.

This note is a cross fingering: there is a key closed below the first open key, as the schematic inset shows. Because of the large size of the tone holes, cross fingerings have little effect at low frequency.

Sound

Sound Clip

You can hear C6
played.

Alternative Fingering

Bb soprano saxophone

Impedance

Impedance spectrum of a Bb
saxophone measured using alternative
fingering for C6.

Sound

Sound spectrum
of a Bb saxophone
played using alternative
fingering for C6.
For more explanation, see Introduction
to saxophone acoustics. This sound spectrum includes some transient excitation, and so has traces of a subharmonic being excited, seen in the range above 4 kHz (compare C5).